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19-5136; rev 4; 9/12 /v denotes an automotive qualified part. +denotes a lead(pb)-free/rohs-compliant package. *ep = exposed pad. ordering information typical operating circuit general description the max13325/max13326 dual audio line drivers provide a reliable differential interface between automotive audio components. the devices feature differential inputs and outputs, integrated output diagnostics, and are controlled using an i 2 c interface or operate in stand-alone mode. the outputs can deliver up to 4v rms into 100 i loads. the max13325 buffers analog audio signals for trans - mission over long cable distances with a fixed gain of 12db, whereas the max13326 provides a 0db fixed gain. the diagnostics on the outputs report conditions on a per channel basis, including short to gnd, short to battery, overcurrent, overtemperature, and excessive offset. the output amplifiers can drive capacitive loads up to 4nf to ground and 3nf differentially. the outputs are protected according to iec 61000-4-2 q 8kv contact discharge, and q 15kv air gap. the max13325/max13326 are specified from -40 n c to +105 n c and are available in a 28-pin tssop package with an exposed pad. applications automotive radio and rear seat entertainment professional remote audio amplifiers features s comprehensive programmability and diagnostics using i 2 c interface s autoretry function in stand-alone mode s drive capacitive loads 3nf differentially, 4nf to ground s 112db signal-to-noise ratio s low 0.002% thd at 4v rms into 2.7k i loads s high psrr (70db at 1khz) s high cmrr (80db at 1khz) s low output noise (3v rms ), max13326 s excellent channel-to-channel matching s load-dump transient protection s protected output against various short-circuit conditions s esd protection for 8kv contact discharge, 15kv air gap s long-distance drive capability typically up to 15m or greater s noise-rejecting differential inputs and outputs s low-power shutdown mode < 10a s hardware or software mute function s 28-pin tssop package with exposed pad part pin- package temp range gain (db) max13325 gui/v+ 28 tssop-ep* -40 n c to +105 n c 12 max13326 gui/v+ 28 tssop-ep* -40 n c to +105 n c 0 add1 c6 100nf to microprocessor from audio source from audio source add0 sda scl flag shdn mute q1 +12v +5v r1 * optional d1 d2** c3 1f v dd v sup 1ki pgnd bias css gnd charge pump i 2 c interface and digital control bias chold cm cp v l c1 470nf c2 1 f c5 220nf c4 10f outlp outlm outrm outrp 1nf 1nf 1nf 1nf c7 2.2f c8 2.2f left inlp inlm c9 2.2f c10 2.2f right inrp inrm *optional : needed for automotive load dump protection only **use d2 when charge pump is off and external supply is provided to c hold output diagnostic esd protection max13325 max13326 1nf 1nf for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxims website at www.maximintegrated.com. dual automotive, audio line drivers with i 2 c control and diagnostic max13325/max13326 evaluation kit available
2 stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. v dd to pgnd ........................................................ -0.3v to +28v chold ................................................................. -0.3v to +28v v l to gnd ............................................................... -0.3v to +6v gnd, pgnd ........................................................ -0.3v to +0.3v out_ to pgnd ........................................................ -0.3v to 28v in_, bias to agnd .................................. -0.3v to (v dd + 0.3v) scl, sda, add0, add1, mute , shdn , flag to gnd .......................................................... -0.3v to +6v out_ short circuit to pgnd or v dd ......................... continuous short circuits between any out_ ............................ continuous continuous power dissipation (t a = +70 n c) (multilayer board) 28-pin tssop (derate 27mw/ n c above +70 n c) ..... 2162.2mw operating temperature range ........................ -40 n c to +105 n c storage temperature range ............................ -65 n c to +150 n c junction temperature ..................................................... +150 n c lead temperature (soldering, 10s) ................................ +300 n c soldering temperature (reflow) ...................................... +260 n c electrical characteristics ( v dd = 14.4v, v l = 5v, r l = j , load impedance from out_+ to out_-, t a = t j = -40 n c to +105 n c, typical values are t a = +25 n c, unless otherwise noted.) (note 2) absolute maximum ratings note 1: package thermal resistances were obtained using the method described in jedec specification jesd51-7, using a four-layer board. for detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial . junction-to-ambient thermal resistance ( q ja ) .......... 37c/w junction-to-case thermal resistance ( q jc ) ................. 2c/w package thermal characteristics (note 1) parameter symbol conditions min typ max units amplifier dc characteristics transient supply voltage (load dump) v ddmax using external nmos- rtr020n05, 300ms duration 50 v operating supply voltage range v dd 4.5 18 v v l 2.7 5.5 v dd ovlo threshold v ddov rising edge 18.5 19.2 v v dd uvlo threshold v dduv falling edge 3.3 3.5 v v l uvlo threshold v luv falling edge 2.2 2.4 v supply current i dd t a = +25 n c, no load 39 ma t a = -40 n c to +105 n c, no load 50 ma logic supply current i l v l = 5v 1.7 ma shutdown supply current i shdn i dd t a = +25 n c 0.5 10 f a t a = -40 n c to +105 n c 0.5 i l < 0.1 2 f a turn-on time (from shutdown) mute = v l 220 ms turn-on time (from mute) shdn = v l , c css = 220nf 6 ms differential input resistance r indif measure across input 18 24 30 k i single-ended input impedance r in each input to ground (max13325) 15 20 25 k i each input to ground (max13326) 12 16 20 signal-path gain (note 3) a v max13325 11.8 12 12.2 db max13326 -0.2 0 +0.2 maxim integrated dual automotive, audio line drivers with i 2 c control and diagnostic max13325/max13326
3 electrical characteristics (continued) ( v dd = 14.4v, v l = 5v, r l = j , load impedance from out_+ to out_-, t a = t j = -40 n c to +105 n c, typical values are t a = +25 n c, unless otherwise noted.) (note 2) parameter symbol conditions min typ max units channel-to-channel gain tracking q 0.4 db differential mode output balance out_+ to out_- (note 4) -40 db output offset voltage (out_+ to out_-) v oos mute = gnd, t a = +25 n c q 0.5 q 10 mv mute = v l , t a = +25 n c q 0.2 q 3 bias voltage v bias relative to v dd 50 52.5 % bias impedance z bias i bias = q 10 f a 69 92 115 k i output-voltage swing differential v dd = 14.4v, v in = q 14.4v, r l = 1k i q 12.5 v v dd = 5.0v, v in = q 5v, r l = 1k i q 4.2 power-supply rejection ratio psrr v dd = 4.5v to 18v -80 -96 db v dd = 14.5v, +500mv p-p ripple at 1khz -95 v dd = 14.5v, +500mv p-p ripple at 10khz -80 common-mode rejection ratio cmrr v in = 1v rms , 100hz to 10khz -48 -80 db amplifier ac characteristics total harmonic distortion plus noise (note 5) thd+n v out = 4v rms , r l = 2.7k i 0.002 % v out = 4v rms , r l = 1k i 0.004 v out = 4v rms , r l = 100 i , v dd = 8v 0.03 v out = 7v rms , r l = 1k i 0.2 total harmonic distortion plus noise at v dd = 5v (note 5) thd+n v out = 1v rms , r l = 2.7k i 0.01 % v out = 1v rms , r l = 1k i 0.02 v out = 2v rms , r l = 1k i 0.8 capacitive-load stability 3 nf capacitive-load drive capability no sustained oscillation c load to gnd 4 nf c load differential 3 signal-to-noise ratio (note 5) snr max13325, gain = 12db, v out = 4v rms , a-weighted 112 db max13326, gain = 0db, v out = 4v rms , a-weighted 122 unity-gain bandwidth 3 mhz output slew rate 2.5 v/ f s output-voltage noise a-weighted, max13325 10 f v a-weighted, max13326 3 crosstalk v in = 1v rms , 1khz -110 db mute time to achieve soft mute, c css = 220nf 4 ms mute attenuation v in = 1v rms , 1khz -75 db click-and-pop level (note 6) k cp into and out of mute -70 dbv click-and-pop level (note 6) k cp into and out of shutdown, 1k i -45 dbv maxim integrated dual automotive, audio line drivers with i 2 c control and diagnostic max13325/max13326
4 electrical characteristics (continued) ( v dd = 14.4v, v l = 5v, r l = j , load impedance from out_+ to out_-, t a = t j = -40 n c to +105 n c, typical values are t a = +25 n c, unless otherwise noted.) (note 2) parameter symbol conditions min typ max units charge pump charge-pump overdrive voltage, v chold C v dd (hard mode) v cph v dd = 4.5v, i source = 6.6ma 3.2 4.0 v v dd = 18v, i source = 6.6ma 4.5 5.5 v chold - v dd (soft mode) v cps v dd unconnected, i source = 40 f a, v l = 3.3v 2.1 v v l = 5v 3.9 charge-pump frequency f cp cpoff = 0 cpf[1:0] = 00 333 khz cpf[1:0] = 01 190 cpf[1:0] = 10 426 cpf[1:0] = 11 260 diagnostics output current limit short to gnd or battery 580 ma current-limit warning threshold 230 ma open-load detection 10 k i output offset detection valid when muted q 250 mv thermal warning threshold 135 n c thermal shutdown threshold 165 n c thermal shutdown hysteresis 15 n c esd protection air gap iec 61000-4-2 out_ pins q 15 kv contact discharge iec 61000-4-2 out_ pins q 8 kv hbm all pins q 2 kv maxim integrated dual automotive, audio line drivers with i 2 c control and diagnostic max13325/max13326
5 digital characteristics (v dd = 14.4v, v l = 3.3v, t a = t j = -40 n c to +105 n c, typical values are t a = +25 n c, unless otherwise noted.) (note 2) note 2: all devices are 100% tested at t a = +25 n c. limits over temperature are guaranteed by design. note 3: signal path gain is defined as: note 3: signal path gain is defined as _ out_ out_ in_ in (v ) (v ) 20 log . (v ) (v ) ? +? + ?? ? ?? ?? ? ?? ?? note 4: measured in differential output mode, differential input voltage 4v p-p (for 0db gain), 1v p-p (for 12db gain) 1khz. common-mode output balance is defined as: common-mode output balance is defined as _ out_ out_ out_ out (|v ) (v ) 20 log . (v ) (v ) 2 ? +? + ?? ? ?? ?? + ?? ?? note 5: 22hz to 22khz measurement bandwidth. note 6: kcp level is calculated as 20log[(peak voltage during mode transition, no input signal)/1v rms ]. units are expressed in dbv. parameter symbol conditions min typ max units digital interface input-voltage high v inh v l = 2.7v to 5.5v 0.75 x v l v input-voltage low v inl v l = 2.7v to 5.5v 0.25 x v l v input-voltage hysteresis 50 mv input leakage current q 100 f a output low voltage flag , sda, i sink = 3ma 0.4 v output leakage current flag , sda = 5.5v 2 f a stand-alone flag pulse width add0, add1 = gnd 100 ms stand-alone fault retry time add0, add1 = gnd 500 ms i 2 c timing serial-clock frequency f scl 0 400 khz bus free time t buf between start and stop conditions 1.3 f s hold time t hd:sta repeated start condition 0.6 f s scl low time t low 1.3 f s scl high time t high 0.6 f s data hold time t hd:dat 0 900 ns data setup time t su:dat 100 ns bus capacitance c b per bus line 400 pf receiving rise time t r scl, sda 20 + 0.1c b 300 ns receiving fall time t f scl, sda 20 + 0.1c b 300 ns transmitting fall time t f sda, v l = 3.6v 20 + 0.05c b 250 ns stop condition setup time t su:sto 0.6 f s pulse width of suppressed spike t sp 0 50 ns maxim integrated dual automotive, audio line drivers with i 2 c control and diagnostic max13325/max13326
6 typical operating characteristics ( v dd = 14.4v, v l = 5v, r l = 1k i , gain = 12db, t a = +25 n c, unless otherwise noted.) shutdown current vs. temperature max13325 toc01 temperature (c) shutdown current (a) 95 80 -25 -10 5 35 50 20 65 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0 -40 no load inputs shorted v shdn = 0v common-mode rejection ratio vs. frequency max13325 toc02 frequency (hz) cmrr (db) 10k 1k 100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -100 10 100k 1v rms input 20khz aes17 filter total harmonic distortion plus noise vs. frequency max13325 toc03 frequency (hz) thdn (%) 10k 1k 100 0.001 0.002 0.003 0.004 0.005 0.006 0.007 0.008 0.009 0.010 0 10 100k left channel 1v rms output right channel total harmonic distortion plus noise vs. output voltage max13325 toc04 output voltage (v rms ) thd+n (%) 9 8 6 7 2 3 4 5 1 0.002 0.004 0.006 0.008 0.010 0.012 0.014 0.016 0.018 0.020 0 01 0 f in = 1khz power-supply rejection ratio vs. frequency max13325 toc05 frequency (hz) psrr (db) 10k 1k 100 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -120 10 100k 500mv p-p ripple crosstalk vs. frequency max13325 toc06 frequency (hz) crosstalk (db) 10k 1k 100 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -140 10 100k 1v rms input 20khz aes17 filter left to right right to left mute attenuation vs. frequency max13325 toc07 frequency (hz) mute attenuation (db) 10k 1k 100 -76 -72 -68 -64 -60 -80 10 100k 2v rms input a-weighted right channel left channel output-noise voltage vs. frequency max13325 toc08 frequency (khz) output-noise voltage (dbv) 18 16 12 14 4 6 8 10 2 -130 -140 -120 -110 -100 90 -80 -70 -60 -50 -40 -30 -20 -10 0 -150 02 0 fft vs. frequency max13325 toc09 frequency (hz) fft (dbv) 10k 1k 100 -135 -120 -105 -90 -75 -60 -45 -30 -15 0 -150 10 100k v out = 1v rms 1khz maxim integrated dual automotive, audio line drivers with i 2 c control and diagnostic max13325/max13326
7 typical operating characteristics (continued) ( v dd = 14.4v, v l = 5v, r l = 1k i , gain = 12db, t a = +25 n c, unless otherwise noted.) output voltage vs. charge-pump overdrive voltage max13325 toc12 (v chold - v dd ) (v) output voltage (v) 4.0 4.5 3.5 2.5 3.0 0.5 1.0 1.5 2.0 7.5 8.0 8.5 9.0 9.5 10.5 10.0 7.0 0 5.0 thdn = 1% f in = 1khz v dd = 14.4 r l = 1k i cpoff = 1 gain vs. temperature max13325 toc14 temperature (c) gain (db) 95 80 -25 -10 5 35 50 20 65 -0.15 -0.10 -0.05 0 0.05 0.10 0.15 0.20 -0.20 -40 max13326 (0db) vout = 1v rms right channel left channel gain error vs. temperature max13325 toc10 temperature (c) gain error (db) 95 80 -25 -10 5 35 50 20 65 -0.015 -0.010 -0.005 0 0.005 0.010 0.015 0.020 -0.020 -40 left channel right channel output-noise voltage vs. frequency max13325 toc13 frequency (khz) output noise voltage (dbv) 18 16 12 14 4 6 8 10 2 -130 -140 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -150 02 0 max13326 (0db) gain error vs. frequency max13325 toc12 frequency (hz) gain error (db) 10k 1k 100 -0.040 -0.035 -0.030 -0.025 -0.020 -0.015 -0.010 -0.005 0 0.005 0.010 0.015 0.020 0.050 0.045 0.025 0.030 0.035 0.040 -0.050 -0.045 10 100k 1v rms output gain error vs. frequency max13325 toc15 frequency (hz) gain error (db) 10k 1k 100 -0.040 -0.030 -0.020 -0.010 0 0.010 0.015 0.020 0.025 0.030 0.035 0.040 0.045 0.050 -0.050 -0.045 -0.035 -0.025 -0.015 -0.005 0.005 10 100k max13326 (0db) 1v rms output maxim integrated dual automotive, audio line drivers with i 2 c control and diagnostic max13325/max13326
8 pin description pin configuration 28 27 26 25 24 23 21 1 2 3 4 5 6 8 css cm cp i.c. i.c. v l bias top view max13325 max13326 outlp outlm pgnd inrm inlm 22 7 chold v dd 19 10 outrm i.c. 20 9 outrp inrp 17 12 connect to pgnd. add1 18 11 gnd i.c. 15 14 scl ep 16 13 sda inlp tssop shdn mute add0 flag + pin name function 1 bias analog bias voltage. bypass bias to gnd with a 10 f f capacitor. 2 v l logic supply voltage. connect v l to a 2.7v to 5v logic supply. bypass v l to gnd with a 0.1 f f capacitor. 3, 4, 10, 11 i.c. internally connected. leave unconnected. 5 inlp left audio positive input. either input of each pair can be used as a single-ended input, with the complementary input bypassed to gnd. 6 inlm left audio negative input. either input of each pair can be used as a single-ended input, with the complementary input bypassed to gnd. 7 v dd power-supply input. connect v dd to the supply voltage. bypass v dd to gnd through a 1 f f capacitor. 8 inrm right audio negative input. either input of each pair can be used as a single-ended input, with the complementary input bypassed to gnd. 9 inrp right audio positive input. either input of each pair can be used as a single-ended input, with the complementary input bypassed to gnd. 12 shdn shutdown input. drive shdn low to power down the device. 13 mute mute input. drive mute low to mute the outputs. the outputs are low impedance in mute. maxim integrated dual automotive, audio line drivers with i 2 c control and diagnostic max13325/max13326
9 pin description (continued) detailed description the max13325/max13326 audio line drivers are designed to transmit audio data across noisy environments. the dif - ferential interface is highly resistant to noise injection from external sources common to automotive applications. the max13325/max13326 operate in stand-alone or i 2 c-compatible mode with diagnostic outputs capable of detecting short to gnd or battery, overcurrent, over - temperature, or excessive offset. a short across another audio output signal line is also protected. table 1. register address map pin name function 14 add0 i 2 c address inputs. connect add0 and add1 to v l , gnd, scl, or sda to select 7 i 2 c addresses. connect add0 and add1 to gnd for stand-alone mode. 15 scl serial clock 16 sda serial-data io 17 add1 i 2 c address inputs. connect add0 and add1 to v l , gnd, scl, or sda to select 7 i 2 c addresses. connect add0 and add1 to gnd for stand-alone mode. 18 gnd analog ground. ground connection for the input bias and gain circuits. 19 outrm right audio negative output. each output is current limited. 20 outrp right audio positive output . each output is current limited. 21 pgnd power ground. ground connection for the output stage drivers. 22 chold charge-pump output (when charge pump is on; cpoff = 0). when the charge pump is off, provide an external supply through a diode to the chold input. bypass chold with 1f to pgnd. 23 outlm left audio negative output. each output is current limited. 24 outlp left audio positive outputs. each output is current limited. 25 cp charge-pump flying capacitor, positive connection 26 cm charge-pump flying capacitor, negative connection 27 flag open-drain fault flag output. flag indicates a fault on any one channel. in stand-alone mode, flag is stretched to a typical pulse width of 100ms. 28 css soft-start capacitor connection. css is charged/discharged by < 100 f a current to get soft mute/ play transition. bypass to gnd through a 220nf capacitor. ep exposed pad. connect to pgnd. address register type name read/write default 0x00 configuration config read/write 0x00 0x01 command byte cmd read/write 0x00 0x02 general fault gfault read 0x00 0x03 left-channel fault lfault cleared on read 0x00 0x04 right-channel fault rfault cleared on read 0x00 0x05 flag flag read 0x04 (12db) 0x05 (0db) 0x06 general mask gmask read/write 0x00 0x07 left-channel mask lmask read/write 0x00 0x08 right-channel mask rmask read/write 0x00 maxim integrated dual automotive, audio line drivers with i 2 c control and diagnostic max13325/max13326
10 configuration register diag: set diag to 1 to enable diagnostic mode. write '0' to disable diagnostic mode. enable: set enable bit to 1 to enable the device. write 0 disables the device. low on the shdn pin overrides the enable bit. mute: set the mute bit to 1 to mute both the output channels. output is low impedance when in mute. low on the mute pin input overrides the mute bit. cpoff: set the cpoff bit to 1 to turn off the charge pump. chold pin must be externally supplied (see the v cph parameter in the electrical characteristics table). charge pump is enabled when cpoff = 0. oldl: write 1 to the oldl bit to initiate the open-load detection for the left channel. to run oldl again, write 0 and 1 again. oldr: write 1 to the oldr bit to initiate the open-load detection for the right channel. to run oldr again, write 0 and 1 again. cpf[1:0]: sets the frequency of the charge pump. command byte register retryr: the right-channel power amplifier switches off after a fault condition. write 1 to turn it back on after the fault condition. retryl: the left-channel power amplifier switches off after a fault condition. write 1 to turn on the left-channel power amplifier after the fault condition. table 2. configuration register format table 3. command byte register format table 2a. charge-pump frequency bits function address code (hex) register data por state (hex) d7 d6 d5 d4 d3 d2 d1 d0 configuration register 0x00 diag enable mute cpoff oldl oldr cpf1 cpf0 0x00 function address code (hex) register data por state (hex) d7 d6 d5 d4 d3 d2 d1 d0 command byte register 0x01 retryr retryl x x x x x x 0x00 cpf1 cpf0 frequency (khz) 0 0 333 0 1 190 1 0 426 1 1 260 maxim integrated dual automotive, audio line drivers with i 2 c control and diagnostic max13325/max13326
11 general faults twarn: the twarn bit is set to 1 when the temperature warning threshold is reached. tshdn: the tshdn is set to 1 when the temperature shutdown threshold is reached. dump: the dump bit is set to 1 when the v dd voltage exceeds the overvoltage threshold. set the appropriate mask bit in the gmask register to detect the general faults. see table 8. left-channel faults svddl: the svddl bit is set to 1 when a short to v dd is detected on the left channel. sgndl: the sgndl bit is set to 1 when a short to gnd is detected on the left channel. limitl: the limitl bit is set to 1 when the current-limit threshold is tripped for left output. offsetl: the offsetl bit is set to 1 when excessive offset is detected on the left-channel output. openl: the openl bit is set to 1 when an open load is detected on the left channel. set the appropriate mask bit in the lmask register to detect the faults on the left channel. see table 9. when any bit of the lfault register is high, the flag output is low. right-channel faults svddr: the svddr bit is set to 1 when a short to v dd is detected on the right channel. sgndr: the sgndr bit is set to 1 when a short to gnd is detected on the right channel. limitr: the limitr bit is set to 1 when the current-limit threshold is tripped for right output. offsetr: the offsetr bit is set to 1 when excessive offset is detected on the right-channel output. openr: the openr bit is set to 1 when an open load is detected on the right channel. set the appropriate mask bit in the rmask register to detect the faults on the right channel. see table 10. when any bit of the rfault register is high, the flag output is pulled low. table 4. general fault register format table 5. left-channel fault register format table 6. right-channel fault register format function address code (hex) register data por state (hex) d7 d6 d5 d4 d3 d2 d1 d0 general fault register 0x02 x twarn tshdn dump x x x x 0x00 function address code (hex) register data por state (hex) d7 d6 d5 d4 d3 d2 d1 d0 left-channel fault register 0x03 svddl sgndl limitl x offsetl openl x x 0x00 function address code (hex) register data por state (hex) d7 d6 d5 d4 d3 d2 d1 d0 right-channel fault register 0x04 svddr sgndr limitr x offsetr openr x x 0x00 maxim integrated dual automotive, audio line drivers with i 2 c control and diagnostic max13325/max13326
12 flag register flag: flag bit is set to 1 when the flag output is logic-low. the flag bit allows to quickly access the status of the device without using the flag output and without having to read all the fault registers. lhighz: the lhighz bit is set to 1 when the left-channel output is high impedance; for example due to a short circuit. rhighz: the rhighz bit is set to 1 when the right-channel output is high impedance; for example due to a short circuit. offsetl: the offsetl bit is set to 1 when excessive offset is detected on the left-channel output. offsetr: the offsetr bit is set to 1 when excessive offset is detected on the right-channel output. id[2:0]: the id[2:0] bits indicate the device type (12db = 100 and 0db = 101). general mask register mtwarn: set mtwarn to 1 to enable the twarn fault detection. see table 4. mtshdn: set mtshdn to 1 to enable the tshdn fault detection. see table 4. mdump: set mdump to 1 to enable the dump fault detection. see table 4. left-channel mask register msvddl: set msvddl to 1 to enable the short to v dd detection on the left channel. msgndl: set msgndl to 1 to enable the short to gnd detection on the left channel. mlimitl: set mlimitl to 1 to enable overcurrent detection on the left channel. moffsetl: set moffsetl to 1 to enable excessive-offset detection on the left-channel output. mopenl: set mopenl to 1 to enable open-load detection on the left channel. table 8. general mask register format table 9. left-channel mask register table 7. flag register format function address code (hex) register data por state (hex) d7 d6 d5 d4 d3 d2 d1 d0 general mask register 0x06 0 mtwarn mtshdn mdump x x x x 0x00 function address code (hex) register data por state (hex) d7 d6 d5 d4 d3 d2 d1 d0 left-channel mask register 0x07 msvddl msgndl mlimitl 0 moffsetl mopenl x x 0x00 function address code (hex) register data por state (hex) d7 d6 d5 d4 d3 d2 d1 d0 flag register 0x05 flag lhighz rhighz offsetl offsetr id2 id1 id0 0x04/0x05 maxim integrated dual automotive, audio line drivers with i 2 c control and diagnostic max13325/max13326
13 right-channel mask register msvddr: set msvddr to 1 to enable the short to v dd detection on the right channel. msgndr: set msgndr to 1 to enable the short to gnd detection on the right channel. mlimitr: set mlimitr to 1 to enable overcurrent detection on the right channel. moffsetr: set moffsetr to 1 to enable excessive-offset detection on the right channel. mopenr: set mopenr to 1 to enable open-load detection on the right channel. table 10. right-channel mask register table 11. output short to v dd /battery diagnostic i 2 c and stand-alone diagnostics when the diag bit and the appropriate mask bits are set to 1, the max13325/max13326 enter diagnostic mode. in this mode, the max13325/max13326 detect short to gnd, short to battery, overcurrent condition, over - temperature condition, excessive offset, and report the diagnosis using the i 2 c serial interface, flag bit, and the flag output. for stand-alone mode, there exists a 500ms stand-alone fault retry function (for autoretry) until the fault goes away. the flag output is pulsed to indicate a fault. output short to v dd when in diagnostic mode, the max13325/max13326 detect if any of the differential outputs is shorted to v dd or battery. upon detection of the short to v dd or battery, the faulted channel is switched off and its output goes into a high-impedance state. the fault is reported using the i 2 c interface and the flag output. see table 11. function address code (hex) register data por state (hex) d7 d6 d5 d4 d3 d2 d1 d0 right-channel mask register 0x08 msvddr msgndr mlimitr 0 moffsetr mopenr x x 0x00 fault condition status report unmask recovery left-channel output short to v dd flag is asserted low. in lmask register, set msvddl bit to 1. see table 9. cleared on reading the lfault register. see table 5. note: 500ms autoretry in stand- alone mode. flag bit set. see table 7. svddl bit is set in the lfault register. see table 5. left channel switches off and output goes to high-impedance state. cannot be masked. output is enabled by setting the retryl bit to 1 in the common byte register. see table 3. right-channel output short to v dd flag is asserted low. in rmask register, set msvddr bit to 1. see table 10. cleared on reading the rfault register. see table 6. note: 500ms autoretry in stand- alone mode. flag bit set. see table 7. svddr bit is set in the rfault register. see table 6. right channel switches off and output goes to high-impedance state. cannot be masked. output is enabled by setting the retryr bit to 1 in the command byte register. see table 3. maxim integrated dual automotive, audio line drivers with i 2 c control and diagnostic max13325/max13326
14 table 12. output short to gnd diagnostic table 13. overtemperature diagnostic output short to gnd when in diagnostic mode, the max13325/max13326 detect if any of the differential outputs is shorted to ground. upon detection of the short to ground, the faulted channel is switched off and its output goes into a high-impedance state. the fault is reported using the i 2 c interface and the flag output. see table 12. overtemperature when in diagnostic mode, if the max13325/max13326 exceed the overtemperature warning or temperature shut - down thresholds the device reports the condition using the i 2 c interface and the flag output. see table 13. fault condition status report unmask recovery left-channel output short to gnd flag is asserted low. in lmask register, set msgndl bit to 1. see table 9. cleared on reading the lfault register. see table 5. note: 500ms autoretry in stand- alone mode. flag bit set. see table 7. sgndl bit is set in the lfault register. see table 5. left channel switches off and output goes to high-impedance state. cannot be masked. output is enabled by setting the retryl bit to 1 in the command byte register. see table 3. right-channel output short to gnd flag is asserted low. in rmask register, set msgndr bit to 1. see table 10. cleared on reading the rfault register. see table 6. note: 500ms autoretry in stand- alone mode. flag bit set. see table 7. sgndr bit is set in the rfault register. see table 6. right channel switches off and output goes to high-impedance state. cannot be masked. output is enabled by setting the retryr bit to 1 in the command byte register. see table 3. fault condition status report unmask recovery overtemperature warning flag is asserted low. in gmask register, set mtwarn bit to 1. see table 8. die temperature falls below warning threshold. cleared on reading the gfault register. flag bit set. see table 7. twarn bit is set in the gfault register. see table 4. overtemperature shutdown flag is asserted low. in gmask register, set mtshdn bit to 1. see table 8. die temperature falls below shutdown threshold. cleared on reading the gfault register. note: 500ms autoretry in stand- alone mode. flag bit set. see table 7. tshdn bit is set in the gfault register. see table 4. left and right channels switch off and output goes to high- impedance state. cannot be masked. left channel is enabled by setting the retryl bit to 1 in the command byte register. right channel is enabled by setting the retryr bit to 1 in the command byte register. see table 3. maxim integrated dual automotive, audio line drivers with i 2 c control and diagnostic max13325/max13326
15 table 15. overcurrent diagnostic table 16. open-load diagnostic table 14. excessive offset diagnostic excessive offset when in diagnostic mode with mute enabled, if there is excessive offset on any output, the max13325/ max13326 reports the condition through the i 2 c inter - face and the flag output. see table 14. overcurrent when in diagnostic mode, if any of the output pairs is excessively loaded, the max13325/max13326 issue a warning and report the condition through the i 2 c inter - face and the flag output. the faulted channel is not switched off. see table 15. open load when in diagnostic mode and the open-load detec - tion is initiated, the selected channel is switched off for 1ms during which the diagnosis is taking place. upon detecting an open load on any channel, the max13325/ max13326 report the condition using the i 2 c interface and the flag output. see table 16. overvoltage when in diagnostic mode, if the max13325/max13326 exceed the v dd overvoltage threshold (for example during a load-dump condition), the device reports the condition using the i 2 c interface and the flag output. see table 17. fault condition status report unmask recovery excessive output offset on left channel flag is asserted low. in the lmask register, set moffsetl bit to 1. see table 9. cleared on reading the lfault register. flag bit set. see table 7. offsetl bit is set in the lfault register. see table 5. excessive output offset on right channel flag is asserted low. in the rmask register, set moffsetr bit to 1. see table 10. cleared on reading the rfault register. flag bit set. offsetr bit is set in the rfault register. see table 6. fault condition status report unmask recovery overcurrent on left channel flag is asserted low. in the lmask register, set mlimitl bit to 1. see table 9. load current falls below the current-limit threshold. cleared on reading the lfault register. flag bit set. see table 7. limitl bit is set in the lfault register. see table 5. overcurrent on right channel flag is asserted low. in the rmask register, set mlimitr bit to 1. see table 10. load current falls below the current-limit threshold. cleared on reading the rfault register. flag bit set. see table 7. limitr bit is set in the rfault register. see table 6. fault condition status report unmask recovery left-channel open load flag is asserted low. in the lmask register, set mopenl bit to 1. see table 9. cleared on reading the lfault register. flag bit set. see table 7. openl bit is set in the lfault register. see table 5. right-channel open load flag is asserted low. in the rmask register, set mopenr bit to 1. see table 10. cleared on reading the rfault register. flag bit set. see table 7. openr bit is set in the rfault register. see table 6. maxim integrated dual automotive, audio line drivers with i 2 c control and diagnostic max13325/max13326
16 applications information serial interface writing to the max13325/max13326 using i 2 c requires that first the master sends a start (s) condition fol - lowed by the devices i 2 c address. after the address, the master sends the register address of the register that is to be programmed. the master then ends com - munication by issuing a stop (p) condition to relinquish control of the bus, or a repeated start (sr) condition to communicate to another i 2 c slave (see figure 1). bit transfer each scl rising edge transfers one data bit. the data on sda must remain stable during the high portion of the scl clock pulse (see figure 2). changes in sda while scl is high are read as control signals (see the start and stop conditions section). when the serial interface is inactive, sda and scl idle high. figure 1. i 2 c timing figure 2. bit transfer table 17. overvoltage diagnostic t low t f sda scl t hd:sta s t su:sta t hd:dat t high t low t su:dat t f t hd:sta t sp p t su:sto s s r t buf t r sda scl data line stable; data valid change of data allowed fault condition status report unmask recovery overvoltage shutdown flag is asserted low. in gmask register, set mdump bit to 1. see table 8. v dd voltage falls below overvoltage threshold. cleared on reading the gfault register. note: 500ms autoretry in stand-alone mode. flag bit set. see table 7. dump bit is set in the gfault register. see table 4. left and right channels switch off and output goes to a high-impedance state. cannot be masked. left channel is enabled by setting the retryl bit to 1. right channel is enabled by setting the retryr bit to 1. see table 3. maxim integrated dual automotive, audio line drivers with i 2 c control and diagnostic max13325/max13326
17 start and stop conditions a master device initiates communication by issuing a start condition, which is a high-to-low transition on sda with scl high. a start condition from the master signals the beginning of a transmission to the max13325/max13326. the master terminates transmis - sion by a stop condition (see the acknowledge bit section). a stop condition is a low-to-high transition on sda while scl is high (figure 3). the stop condi - tion frees the bus. if a repeated start condition is generated instead of a stop condition, the bus remains active. when a stop condition or incorrect slave id is detected, the device internally disconnects scl from the serial interface until the next start or repeated start condition, minimizing digital noise and feedthrough. acknowledge bit the acknowledge (ack) bit is a clocked 9th bit that the max13325/max13326 use to handshake receipt of each byte of data when in write mode. the max13325/ max13326 pull down sda during the entire master- generated 9th clock pulse if the previous byte is suc - cessfully received (see figure 4). monitoring ack allows for detection of unsuccessful data transfers. an unsuccessful data transfer occurs if a receiving device is busy or if a system fault has occurred. in the event figure 3. start/stop conditions figure 4. acknowledge and not-acknowledge bits table 18. slave address sda start condition stop condition scl sda s scl 18 not acknowledge acknowledge 9 add1 add0 a6 a5 a4 a3 a2 a1 a0 r /w slave address read (hex) slave address write (hex) mode gnd gnd stand- alone v l gnd 1 1 0 0 0 0 1 1/0 0xc3 0xc2 i 2 c gnd v l 1 1 0 0 0 1 0 1/0 0xc5 0xc4 i 2 c v l v l 1 1 0 0 0 1 1 1/0 0xc7 0xc6 i 2 c scl v l 1 1 0 0 1 0 0 1/0 0xc9 0xc8 i 2 c sda v l 1 1 0 0 1 0 1 1/0 0xcb 0xca i 2 c v l scl 1 1 0 0 1 1 0 1/0 0xcd 0xcc i 2 c v l sda 1 1 0 0 1 1 1 1/0 0xcf 0xce i 2 c maxim integrated dual automotive, audio line drivers with i 2 c control and diagnostic max13325/max13326
18 of an unsuccessful data transfer, the bus master may retry communication. the master must pull down sda during the 9th clock cycle to acknowledge receipt of data when the max13325/max13326 are in read mode. an acknowledge must be sent by the master after each read byte to allow data transfer to continue. a not- acknowledge is sent when the master reads the final byte of data from the max13325/max13326, followed by a stop condition. slave address the max13325/max13326 are programmable to one of seven i 2 c slave addresses. these slave addresses are unique device ids. connect add_ to gnd, v l , scl, or sda to set the i 2 c slave address. the address is defined as the seven most significant bits (msbs) followed by the read/write bit. set the read/write bit to 1 to configure the max13325/max13326 to read mode. set the read/ write bit to 0 to configure the device to write mode. the address is the first byte of information sent after the start condition. register address map single-byte write operation for a single-byte write operation, send the slave address as the first byte followed by the register address and then a single data byte (see figure 5). burst write operation for a burst write operation, send the slave address as the first byte followed by the register address and then the data bytes (see figure 6). single-byte read operation for a single-byte read operation, send the slave address with the read bit set, as the first byte followed by the reg - ister address. then send a repeated start condition followed by the slave address. after the slave sends the data byte, send a not-acknowledge followed by a stop condition (see figure 7). burst read operation for a burst read operation, send the slave address with a write as the first byte followed by the register address. then send a repeated start condition followed by the slave address. the slave sends data bytes until a not- acknowledge condition is sent (see figure 8). figure 5. a single-byte write operation figure 6. a burst write operation s s7 s6 s5 s4 s3 s2 s1 ack b7 b6 b5 b4 b3 b2 b1 b0 ack p c7 c6 c5 c4 c3 c2 c1 c0 ack r/w = 0 slave address data 1 register address s s7 s6 s5 s4 s3 s2 s1 ack b7 b6 b5 b4 b3 b2 b1 b0 ack b7 b6 b5 b4 b3 b2 b1 b0 ack r7 r6 r5 r4 r3 r2 r1 r0 ack slave address data 1 register address data 2 r/w = 0 ack b7 b6 b5 b4 b3 b2 b1 b0 ack p data n maxim integrated dual automotive, audio line drivers with i 2 c control and diagnostic max13325/max13326
19 figure 7. a single-byte read operation figure 8. a burst read operation charge pump the max13325/max13326 charge pump can be dis - abled depending on application requirements. when charge pump is enabled [cpoff = 0], please follow the charge-pump capacitor selections. when the charge pump is disabled [cpoff = 1], the flying capacitor (c1) is not needed. there are internal diodes between v dd/ out_ to chold, so it is important that chold not be forced below v dd or any of the outputs. a series diode needs to be placed between the external supply (v sup ) and chold. see d2 in the typical operating circuit . charge-pump capacitor selection use ceramic capacitors with a low esr for optimum per - formance. for optimal performance over the extended temperature range, select capacitors with an x7r dielectric. table 19 lists suggested manufacturers. flying capacitor (c1) the value of the flying capacitor (see the typical operating circuit ) affects the charge pumps load regu - lation and output resistance. a c1 value that is too small degrades the devices ability to provide sufficient current drive, which leads to a loss of output voltage. increasing the value of c1 improves load regulation and reduces the charge-pump output resistance. for optimum perfor - mance, use a 470nf capacitor for c1. when the charge pump is disabled [cpoff = 1], the flying capacitor (c1) is not needed. hold capacitor (c2) the hold capacitor value (see the typical operating circuit ) and esr directly affect the ripple at the internal negative rail. increasing the value of c2 reduces output ripple. likewise, decreasing the esr of c2 reduces both ripple and output resistance. lower capacitance values can be used in systems with low maximum output power levels. for optimum performance, use a 1 f f capacitor for c2. table 19. suggested capacitor vendors s s7 s6 s5 s4 s3 s2 s1 ack b7 b6 b5 b4 b3 b2 b1 b0 ack slave address register address r/w = 0 sr s7 s6 s5 s4 s3 s2 s1 ack b7 b6 b5 b4 b3 b2 b1 b0 nack p slave address data r/w = 1 s s7 s6 s5 s4 s3 s2 s1 ack b7 b6 b5 b4 b3 b2 b1 b0 ack slave address register address r/w = 0 sr s7 s6 s5 s4 s3 s2 s1 ack b7 b6 b5 b4 b3 b2 b1 b0 ack slave address data 1 r/w = 1 ack b7 b6 b5 b4 b3 b2 b1 b0 nack p data n supplier phone fax website murata electronics north america, inc. 770-436-1300 770-436-3030 www.murata-northamerica.com taiyo yuden 800-348-2496 847-925-0899 www.t-yuden.com tdk corp. 847-803-6100 847-390-4405 www.component.tdk.com maxim integrated dual automotive, audio line drivers with i 2 c control and diagnostic max13325/max13326
20 package information for the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages . note that a +, #, or - in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. chip information process: bcd power-supply bypass capacitor (c3) the power-supply bypass capacitor (see the typical operating circuit ) lowers the output impedance of the power supply, and reduces the impact of the max13325/ max13326 charge-pump switching transients. bypass v dd with c3, the same value as c2, and place it physi - cally close to the v dd and pgnd pins. load-dump protection with minimal external components, the max13325/ max13326 can be protected against automotive load- dump conditions. see the typical operating circuit . nmosfet (q1) q1 should be selected to withstand the full-voltage expo - sure (bv dss > 45v). the gate-source turn-on voltage should be chosen to be less than v cps to ensure initial startup. using an external nmos, rtr020n05, 300ms duration component provides 50v load-dump protection. zener diode (d1) during short-to-battery condition, out_ lifts up chold using an internal diode. in order not to violate the maxi - mum gate-source voltage of q1, a zener diode of appro - priate clamping voltage should be added between the gate and source terminals. series resistor (r1) normally, a series resistor for current limitation is needed during short-to-battery condition. r1 should be chosen according to (18v - v dd(min) - v zener )/1ma so that no excessive current is being drawn from chold. layout and grounding proper layout and grounding are essential for optimum performance. connect the ep and gnd together at a single point on the pcb. ensure ground return resistance is minimized for optimum crosstalk performance. package type package code outline no. land pattern no. 28 tssop-ep u28e+5 21-0108 90-0147 maxim integrated dual automotive, audio line drivers with i 2 c control and diagnostic max13325/max13326
maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. the parametric values (min and max limits) shown in the electrical characteristics table are guaranteed. other parametric values quoted in this data sheet are provided for guidance. maxim integrated 160 rio robles, san jose, ca 95134 usa 1-408-601-1000 21 ? 2012 maxim integrated the maxim logo and maxim integrated are trademarks of maxim integrated products, inc. revision history revision number revision date description pages changed 0 1/10 initial release 1 3/10 updated the typical operating circuit 1 2 4/10 added new register bits to tables 1, 2, and 7. revised flag register section and added table 2a and charge pump section. 1, 4, 7, 8C12, 19, 20 3 6/10 introduced the max13326. updated the electrical characteristics table and added new typical operating characteristics graphs. 1, 4, 5, 7 4 9/12 corrected slave addresses in table 18 17 dual automotive, audio line drivers with i 2 c control and diagnostic max13325/max13326

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